Maharashtra HSC Class 12 Chemistry March 2023 question paper with answers

Section A

1 mark each

Select and write the correct answer for the following multiple choice type of questions:
Q.1 (i)1 mark $The relation between radius of sphere and edge length in body centered cubic lattice is given by formula:$
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Q.1 (ii)1 mark $\mathrm{OH^{-}}$
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Q.1 (iii)1 mark $Which of the following correctly represents integrated rate law equation for a first order reaction in gas phase:$
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Q.1 (iv)1 mark $\mathrm{Mn^{2+}}$
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Q.1 (v)1 mark $The correct formula of a complex having IUPAC name Tetraamminedibromoplatinum (IV) bromide is ______.$
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Q.1 (vi)1 mark $The allylic halide, among the following is _______. (Option (C) is printed as a drawn structure — see the figure.)$
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Q.1 (vii)1 mark $The product of following reaction is$
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Q.1 (viii)1 mark $Ozonolysis of 2, 3 dimethyl but-2-ene, followed by decomposition by Zn dust and water gives ________.$
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Q.1 (ix)1 mark $The glycosidic linkage present in maltose is ________.$
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Q.1 (x)1 mark $The monomer of natural rubber is ________.$
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Answer the following questions:
Q.2 (i)1 mark $Write the name of the technique used to know geometry of nanoparticles.$
Q.2 (ii)1 mark $\mathrm{LiAlH_4}$
Q.2 (iii)1 mark $Write the structure of the product formed when chlorobenzene is treated with sodium metal in the presence of dry ether.$
Q.2 (iv)1 mark $Write the chemical composition of cryolite.$
Q.2 (v)1 mark $Write the name of platinum complex used in the treatment of cancer.$
Q.2 (vi)1 mark $Write the SI unit of cryoscopic constant.$
Q.2 (vii)1 mark $Write the correct condition for spontaneity in terms of Gibbs energy.$
Q.2 (viii)1 mark $\mathrm{BaCl_2}$

Section B

2 marks each · attempt any 8

Q.32 marks $Distinguish between lanthanides and actinides.$
Q.42 marks $Calculate the mole fraction of solute, if the vapour pressure of pure benzene at certain temperature is 640 mmHg and vapour pressure of solution of a solute in benzene is 600 mmHg.$
Q.52 marks $Define: Green chemistry. Write two advantages of nanoparticle and nanotechnology.$
Q.62 marks $Explain the following terms: (i) Substitutional impurity defect (ii) Interstitial impurity defect$
Q.7 (i)2 marks $\mathrm{H_2SO_4}$
Q.7 (ii) $Write the chemical reactions for the following: (ii) Ethyl bromide is heated with silver acetate$
Q.82 marks $\mathrm{PbI_2}$
Q.92 marks $What is the action of the following reagents on ethyl amine (i) Chloroform and caustic potash (ii) Nitrous acid$
Q.102 marks $\mathrm{Cd_{(s)} + Sn^{2+}_{(aq)} \longrightarrow Cd^{2+}_{(aq)} + Sn_{(s)}}$
Q.112 marks $Write chemical reaction for the preparation of glucose from sucrose. Write structure of D-ribose.$
Q.12 (i)2 marks $Define Extensive property.$
Q.12 (ii) $10\ \mathrm{dm^{3}}$
Q.132 marks $Write the reactions for the formation of nylon 6,6 polymer.$
Q.142 marks $Draw structures of the following compounds: (i) chloric acid (ii) peroxy disulphuric acid$

Section C

3 marks each · attempt any 8

Q.15 (i)3 marks $Define Osmosis.$
Q.15 (ii) $How will you determine molar mass of non volatile solute by elevation of boiling point?$
Q.16 (i)3 marks $Convert the following: (i) Ethyl alcohol into ethyl acetate$
Q.16 (ii) $Convert the following: (ii) Phenol into benzene$
Q.16 (iii) $Convert the following: (iii) Diethyl ether into ethyl chloride$
Q.173 marks $A weak monobasic acid is 10% dissociated in 0.05 M solution. What is percent dissociation in 0.15 M solution?$
Q.183 marks $Explain dehydrohalogenation reaction of 2-chlorobutane. Write use and environmental effect of CFC.$
Q.193 marks $(R = 8.314\ \mathrm{JK^{-1}\ mol^{-1}})$
Q.203 marks $What are interstitial compounds? Give the classification of alloys with examples.$
Q.213 marks $\mathrm{H_2 - O_2}$
Q.223 marks $\mathrm{[CoF_6]^{3-}}$
Q.233 marks $What is Pseudo first order reaction? Derive integrated rate law equation for zero order reaction.$
Q.243 marks $Explain Aldol condensation of ethanal.$
Q.253 marks $Explain anomalous behaviour of oxygen in group 16 with respect to: (i) Atomicity (ii) Magnetic property (iii) Oxidation state$
Q.26 (i)3 marks $Write chemical reactions for the following conversions: (i) Acetic acid into acetic anhydride (ii) Acetic acid into ethyl alcohol$
Q.26 (ii) $Write IUPAC name and structure of methylphenylamine.$

Section D

4 marks each · attempt any 3

Q.27 (i)4 marks $Show that, time required for 99.9% completion of a first order reaction is three times the time required for 90% completion.$
Q.27 (ii) $Give electronic configuration of Gd (Z = 64).$
Q.27 (iii) $Write the name of nano structured material used in car tyres to increase the life of tyres.$
Q.28 (i)4 marks $\Delta H$
Q.28 (ii) $Define: Vulcanization$
Q.28 (iii) $What is peptide bond?$
Q.29 (i)4 marks $Silver crystallizes in fcc structure. If edge length of unit cell is 400 pm, calculate density of silver (Atomic mass of Ag = 108).$
Q.29 (ii) $Write a note on Haloform reaction.$
Q.30 (i)4 marks $\mathrm{[Co(NH_3)_4Cl_2]^{+}}$
Q.30 (ii) $What is reference electrode?$
Q.30 (iii) $Give reason: Bleaching action of ozone is also called dry bleach.$
Q.31 (i)4 marks $Write Dow process for preparation of Phenol. What is the action of bromine water on phenol?$
Q.31 (ii) $16^{\text{th}}$